local HKDF = require("lockbox.kdf.hkdf");
local SHA1 = require("lockbox.digest.sha1");
local SHA256 = require("lockbox.digest.sha2_256");

local Array = require("lockbox.util.array");

local tests = {
    {
        ikm = Array.fromHex("0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b"),
        salt = Array.fromHex("000102030405060708090a0b0c"),
        info = Array.fromHex("f0f1f2f3f4f5f6f7f8f9"),
        outputLen = 42,
        digest = SHA256,
        output = "3cb25f25faacd57a90434f64d0362f2a2d2d0a90cf1a5a4c5db02d56ecc4c5bf34007208d5b887185865"
    },
    {
        ikm = Array.fromHex("000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232" ..
                            "425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f404142434445464748494a4b4c4d4e4f"),
        salt = Array.fromHex("606162636465666768696a6b6c6d6e6f707172737475767778797a7b7c7d7e7f80818283" ..
                             "8485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9fa0a1a2a3a4a5a6a7" ..
                             "a8a9aaabacadaeaf"),
        info = Array.fromHex("b0b1b2b3b4b5b6b7b8b9babbbcbdbebfc0c1c2c3c4c5c6c7c8c9cacbcccdcecfd0d1d2d3" ..
                             "d4d5d6d7d8d9dadbdcdddedfe0e1e2e3e4e5e6e7e8e9eaebecedeeeff0f1f2f3f4f5f6f7" ..
                             "f8f9fafbfcfdfeff"),
        outputLen = 82,
        digest = SHA256,
        output = "b11e398dc80327a1c8e7f78c596a49344f012eda2d4efad8a050cc4c19afa97c59045a99cac7827271cb" ..
                 "41c65e590e09da3275600c2f09b8367793a9aca3db71cc30c58179ec3e87c14c01d5c1f3434f1d87"
    },
    {
        ikm = Array.fromHex("0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b"),
        salt = {},
        info = nil,
        outputLen = 42,
        digest = SHA256,
        output = "8da4e775a563c18f715f802a063c5a31b8a11f5c5ee1879ec3454e5f3c738d2d9d201395faa4b61a96c8"
    },
    {
        ikm = Array.fromHex("0b0b0b0b0b0b0b0b0b0b0b"),
        salt = Array.fromHex("000102030405060708090a0b0c"),
        info = Array.fromHex("f0f1f2f3f4f5f6f7f8f9"),
        outputLen = 42,
        digest = SHA1,
        output = "085a01ea1b10f36933068b56efa5ad81a4f14b822f5b091568a9cdd4f155fda2c22e422478d305f3f896"
    },
    {
        ikm = Array.fromHex("000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232" ..
                            "425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f404142434445464748494a4b4c4d4e4f"),
        salt = Array.fromHex("606162636465666768696a6b6c6d6e6f707172737475767778797a7b7c7d7e7f80818283" ..
                             "8485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9fa0a1a2a3a4a5a6a7" ..
                             "a8a9aaabacadaeaf"),
        info = Array.fromHex("b0b1b2b3b4b5b6b7b8b9babbbcbdbebfc0c1c2c3c4c5c6c7c8c9cacbcccdcecfd0d1d2d3" ..
                             "d4d5d6d7d8d9dadbdcdddedfe0e1e2e3e4e5e6e7e8e9eaebecedeeeff0f1f2f3f4f5f6f7" ..
                             "f8f9fafbfcfdfeff"),
        outputLen = 82,
        digest = SHA1,
        output = "0bd770a74d1160f7c9f12cd5912a06ebff6adcae899d92191fe4305673ba2ffe8fa3f1a4e5ad79f3f334" ..
                 "b3b202b2173c486ea37ce3d397ed034c7f9dfeb15c5e927336d0441f4c4300e2cff0d0900b52d3b4"
    },
    {
        ikm = Array.fromHex("0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b"),
        salt = {},
        info = nil,
        outputLen = 42,
        digest = SHA1,
        output = "0ac1af7002b3d761d1e55298da9d0506b9ae52057220a306e07b6b87e8df21d0ea00033de03984d34918"
    },
    {
        ikm = Array.fromHex("0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c"),
        salt = nil,
        info = nil,
        outputLen = 42,
        digest = SHA1,
        output = "2c91117204d745f3500d636a62f64f0ab3bae548aa53d423b0d1f27ebba6f5e5673a081d70cce7acfc48"
    }
};

for _, v in pairs(tests) do
    local res = HKDF()
                    .setDigest(v.digest)
                    .setInputKeyMaterial(v.ikm)
                    .setSalt(v.salt)
                    .setInfo(v.info)
                    .setOutputLen(v.outputLen)
                    .finish()
                    .asHex();

    assert(string.lower(res) == v.output,
            string.format("TEST FAILED IKM(%s) EXPECTED(%s) ACTUAL(%s)",
                    Array.toHex(v.ikm),
                    v.output,
                    res));
end
